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    Question

    The average of 10 numbers is 30. If one of the numbers

    is excluded, the average of the remaining numbers becomes 28. Find the excluded number.
    A 40 Correct Answer Incorrect Answer
    B 42 Correct Answer Incorrect Answer
    C 44 Correct Answer Incorrect Answer
    D 48 Correct Answer Incorrect Answer

    Solution

    Total sum of 10 numbers = 10 × 30 = 300. Total sum of 9 numbers = 9 × 28 = 252. Thus, the excluded number = 300 - 252 = 48.

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